I think that Dodger’s reaction wasn’t over the top. I don’t know all the things they did to “rescue” Oliver, but it seemed like a lot and it was risky too. To find out that Oliver wasn’t even grateful at all and just wanted to go back must have hurt. After all, he had given Oliver a family first, and everyone else seemed to genuinely care about him too. And so after everything they’d done, thinking that they were helping him, only to find out that he doesn’t want any of it would be devastating to anyone. Sure, it’s all just a miscommunication between them, but Oliver could have explained the situation more tactfully, and not simply dismiss his old family for someone he just met.